A microstrip patch antenna as a standard transmitting and receivingantenna

The possibility of using a microstrip patch antenna as a standard transmitting or receiving antenna is discussed. The intrinsic properties of the substrate used for the antenna are determined by careful impedance measurements. Experimental results indicate that the transmitting characteristics of a microstrip antenna can be theoretically determined from its geometry. The microstrip patch antenna discussed is physically small (20-cm² for 450 MHz) and can be well matched to a 50-Ω power delivery system (SWR=1.17)